Effervescent cleaner and deodorizer in a convenient drop-in packet quickly and safely neutralize odor-causing compounds with maximum-strength, maximum odor-fighting power. Long-lasting, fresh-smelling, water-soluble formula cleans and deodorizes for up to one full week while breaking down waste and tissue. Formaldehyde-free and environmentally-friendly. Safe for use in all RV and marine holding tanks. Six packets per box. Use 1 packet per 40 gal. tank.